Friction safety stop



June 16, ,1925. 1,542,519

O.F.RMNBOLT FRICTION SAFETY STOP Filed July 28, 1924 2 Sheets-Sheet i bd 27 42 6 i3 6 A 25 l I 6 33 ,{17 20 4 A 5 g i v amounts a H 21 22OPaLEKainhobb June 16,1925. 1,542,519

O. F. RAINBOLT FRI CTI ON SAFETY STOP Filed July 28, 192A 2 Sheets-fine2 Swuemtoz 6 OraLEKaZnhalb Patented June 16, 1925.

' UNITED STATES ORAL F. RAINBOLT, OF LYONS, INDIANA.

rnror'ron SAFETY s'ror.

Application fil ed July 28, 19241 Serial No. 728,722.

To all whom it may concern:

Be it known that I, ORAL F. RAINBOLT, a citizen of the United States,residing at Lyons, in the county of Greene and State of Indiana, haveinvented a new and useful Friction Safety Stop, of whichthe following isa specification. The present invention relates to safety devices forelevators, lifts, or the like and aims to provide novel means wherebythe elevator or lift equipped with the safety device'will beautomatically stopped in its downward movement to insure against injuryto per sons riding thereon.

An important object of the invention isto provide a device of thischaracter which will operate to gradually retard the movement of theelevator lift, prior to its'stopping, thereby eliminating the sudden jarincident to an elevator or lift stopping abruptly.

A still further object of the invention is the provision of a device ofthischaracter which will be readily and easily installed on elevators orlifts now in use, eliminating the necessity of makingalterations in theelevator orlift construction to apply the device.

With the foregoing and other objects in view which will appearas thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed, may be made within thescope of what is claimed, without departing from the spirit of theinvention. Referring to the drawings:

Figure 1 is an elevational view disclosing a safety device constructedin accordance with the invention as mounted on| an elevator.

Figure 2 is a plan view thereof.

Figure 3 is a sectional view taken on line 3-3 of Figure 1.

Figure 1 is a sectional view taken 4-4: of Figure. 1.

Figure 5 is a sectional view taken on line 55 of Figure 2.

Figure 6 is a sectional View taken on line 66 of Figure 2.

Referring to the drawings in detail, the reference character 5 guideswhich are engaged by the arms 6 car ried by the elevator frametosupportthe elevator against lateral movement.

The reference character 7 indicates the on line designates spaced upperbeam of the elevator frame and the reference character 8 indicatesvertical side bars which have their upper ends secured to the beam 7 andbraced against movement, by 7 means of the brace members Q arrangedadjacent to the upper ends of the bars 8. As

beam 7, the opposite end thereof operating in the bearing 15 which ismounted on the sliding plate 16 that moves in the guideways 17positioned on theplate 18 that in turn is mounted on the beam 7.

Threads 19 are formed on the shaft 13 adjacent to one side thereof,while the threads 20 which are disposed inthe opposite direction, arearranged on the shaft 13 at the opposite side thereof for purposes to behereinafter more fully described.

Operating through the bearing 15 and positioned on the shaft 13 is asleeve 21 that carries the beveled pinion 22, which pinion issecured inposition on the sleeve at 21 by means of the set screw 23 and as clearlyshown by Figure 6 of the drawings, the sleeve is formed with asquaredopening to be fitted over the squared extremity 24 of the shaft18 so that the sleeve may be free to move longitudinally of the shaft 13and at the same time receive rotary motion therefrom which in turn isimparted to the pinion 22. 1

- The pinion 22 is in mesh with the beveled pinion 25 which is mountedon the shaft 26 that has one end thereof positioned in the socket 27 ofthe bearing member 15, the opposite end of the shaft 26 being mounted inthe bearing 28 carried at the upper end of the arm 29 that is alsosecured to the sliding plate 16 to the end that when the pinion 22 ismoved longitudinally of the shaft, the beveled pinion 25 is also movedin a direction longitudinally of the shaft 13.

Teeth 29 are formed on the periphery of the pinion 25 and are designedto cooperate with the teeth 30 provided on the inner edge grooved member31 in which, the forked end of the arm 32 moves, which arm 32 has anextension 33 that is connected to the cable 10 at 34, the extension 33being acted on by the coiled spring 35 that has one end thereof anchoredto the plate 18 by means of the eye bolt 36. Thus it will be seenthatdue to the connection between the eXtension33 and cable 10, the pinions22 and 25 will be normally held in their inactive positions but when thecable breaks under excessive weight, the coiled spring will act to movethe, extension 33 downwardly and causing the pinions 22 and 25 to moveoutwardly or towards the guide 5, the teeth of the pinion 25 meshingwith the teeth 30. of the guide 5 with the result that rotary movementis transmitted to the shaft 13 through the pinions 25 and 22.

A latch member indicated at 37 lies in the path of travel of theextension 33, on its downward movement and engages ,the extension 33 tohold the same'to its active position after it has been moved downward-1y by the spring 35. The reference character 38 indicates grippingmembers which are pivotally mounted at the outer ends of the arms 39that have cam surfaces 40 which are engaged by the rollers 41 carried onthe arms 42 that have their lower ends pivotally connected to the arms43 that are secured to the beams 8 of the elevator frame.

The upper ends of the arms 42 carry threaded eyes 44 that are-mounted onthe threaded portions 19 and 20 respectively of the shaft 13 so that asthe shaft 13 is rotated, the upper ends of the arms 42 will be movedtowards each other, to the end that the rollers 41 are moved towardseach other over the cam surfaces 40 causing the outer ends of the arms39 which carry the gripping members 38 to move towards each other,grippingthe guides 5 associated therewith.

The arms 39- are pivotally connected at 42 so that movement of the innerends of the arms 39 will produce a relative movement of the oppositeends of the arms 39, inthe opposite directions.

These arms 39 are supported by the links 43 that have connectiontherewith through the'eye bolt 44, the upper ends of thelinks 43 beingconnected to the eye beam 7, by means of the bolts 45. Coiled springs 46connect the inner ends of the arms 39 to normally urge the arms towardseach other, at their inner ends.

It is believed that in view of the foregoing, the operation of thedevice will be clear and that a furtherdetail description as to theoperation of the device is unnecessary, however it might be statedthatafter the gripping members have been operated to accomplish the purposeof the invention, the lever 46 which has connection with the shaft 13may be operated over the ratchet wheel 47 to rotate the shaft 13 in theopposite direction to release the pinion 25 and cause it to disengagethe teeth of the guide 5.

I claim 1. An automatically operated stop device for an elevatoroperating between toothed guides and having a lifting cable including ashaft, pinions slidably mounted on the shaft, a pivoted arm havingconnection with one of the pinions to move the pinions to their activepositions, said arm having connection with the cable to normally holdthe arm in its inactive position, a spring for moving the arm to itsactive position, and means controlled by the movements of the shaft forgripping the guides to retard movement of the elevator.

2. An automatically operated stop device for an elevator operatingbetween toothed guides and having a lifting cable, pinions slidablymounted on the shaft, said shaft having oppositely disposed threads,means for moving the pinions into engagement with the teeth of theguides when the cable breaks,arms having threaded eyes operating on thethreaded portions of the shaft, and gripping members adapted to be movedinto engagement with the guides when the arms are moved over thethreaded portions of the shaft.

3. An automatically operated stop device vfor an elevator operatingbetween guides, a shaft carried by the elevator, means at one end of theshaft and adapted to be thrown into engagement with one of the guidesfor rotating the shaft, arms pivotally mounted ,on the elevator andcarrying gripping members at their outer ends, said arms having camsurfaces, pivoted arms having their lower ends disposed between the camsurfaces of the first mentioned arms, to move .the arms and cause thegripping members to grip the guides, and said last mentioned arms havingeyes removable on the shaft to cause the arms to move when the shaft isrotated.

4. An automatically operated stop device for an elevator operatingbetween guides, and having an elevating cable, a shaft car ried by theelevator, means at one end of the shaft and adapted to be automaticallymoved into engagement with one of the guides to cause the shaft torotate, arms pivotally mounted on the elevator, grippingmembers on theouter ends of the arms and means operating between the arms and mountedon the shaft to move longitudinally thereof for moving the arms andcausing thegripping members to grip the guides.

5. An automatically operated stop device for an elevator operatingbetween guides, and having an elevating cable, a shaft mounted on theelevator, said shaft having threaded portions, a shaft operating member,

member slidable on the shaft and adapted arms to cause the grippingmembers to grip to be moved into engagement With one of the the guides.guides for imparting rotary movement to In testimony that I claim theforegoing the shaft, means having connection with the as my own, I havehereto aflixed my Sig 5 cable for moving the shaft operating memnaturein the presence of tWo Witnesses.

her to its active ositions, arms carrying gripping members pivotallysupported by ORAL RAINBOLI the elevator, and arms having threadedWitnesses:

ortions moving over the threaded portions WEBSTER V. MOFFETT, 10 of theshaft for moving the first mentioned THEO. S. RAINBOLT.

